RLJ

The ones I received from Vietnam are definitely stainless. Their website states it, they scratch pretty easily and a magnet doesn’t stick to them. They are not wavy. Futofab states theirs are chrome plated steel.

Just saw this note on the ebay listing for the Vietnam bumpers. Due to US customs policies, the buyer of this item will need to pay import fees to the shipping carrier prior to delivery. Learn more

Futofab is showing front and rear bumpers in stock. https://www.futofab.com/index.php?option=com_content&view=category&layout=blog&id=20&Itemid=38

I bought a set for my 510 wagon. eBay was selling them and still is. https://www.ebay.com/itm/395239288037?fits=Model%3A510|Make%3ADatsun&_skw=datsun+510+bumpers&itmmeta=01K9K7XV8ZQD0F7RE48RCZGQK2&hash=item5c0618ece5:g:jKkAAOSwEMhl4tbk&itmprp=enc%3AAQAKAAAA0FkggFvd1GGDu0w3yXCmi1ctt%2F2%2Fc6eXrv%2FLplSrrRaDUFgbTNehLO5hn0TYNu%2F6zrW%2F4ZaROD71YTxB70OhPCO7fxCdikLJ7ryAyopQrjiOYA9UsZCxkRUTz8fjaqxEYX6Y7%2FX4LD0My9en02CDm%2FPCEiSCwhYaBmDL4rF9dEiQIzz5p0eyJ85X0O%2Bk039VUzy5gn6HFnyEuP0SzD4pFmu5E9KVyuiMk43XeR2ubkmZVPvuTyW88PaW3f0TZ5TRvekO1%2FtujcbRqWUG%2Bm7ZG2g%3D|tkp%3ABk9SR9q09-fMZg So you might have some recourse with ebay and PayPal, maybe! I got mine before all the tariff crap and not sure if tariffs apply to Vietnam or not. Usually ebay has a banner in the listing talking about the tariffs and I don’t see one for this listing. My observations: They are stainless steel and polished to a real nice chrome look. Being stainless they're soft and scratch easily. True chrome is harder than stainless. The mounting brackets welded on to the bumpers are thin and flimsier then the stock ones. The welds holding them on are minuscule. Really don’t think these bumpers would hold up well in an accident but really don’t think the stock bumpers would either. The front bumper is an excellent fit and looks great. The factory rear bumper for the wagon seems to be narrower than the sedan rear bumper. That being said the Vietnam bumpers stick out more at the quarter panels on my wagon. Took about 10-12 weeks after I ordered them to receive them. They were packaged very nicely and traveled without any damage to the bumpers. I was quoted starting at $700 each for repairing and re-chroming the stock bumpers and they would give a firmed up price once they saw them. Somehow I think you could bet money they’d be a lot more once they see them. Don’t know if the bumper places are even still in business. As others have said, chroming is not environmentally friendly, especially in California. A few of the USA vendors occasionally have bumpers but it’s hit or miss on availability. There were none I could find when I needed mine so I ordered the Vietnam ones.

That’s an interesting one. Never seen that done before on a 510.

With rockers in it will do that when turning the cam. Rockers had to be pulled or loosened completely so all the valves are down below head surface to machine the head surface.

Agree

Were the rockers out when you tried it?

Warped .016. Did the machine shop check the top of the head for straightness?

Just the facts. I've seen the dyno sheet.

Just to throw a wrench in the stock manifold debate. Know of a Rebello 2.3 using a the good cast iron manifold making 220 hp. Granted it probably would have made 235-240 with a header. Appears the cast iron manifold is not as much of a hinderance as thought.